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Representative photomicrographs (scale bar=40 μm) showing acetylated histone H3-K9 (top panel) and HDAC2 (bottom panel) gold immunolabeling in the VTA of repeated saline treatment (Control), repeated ethanol treatment with last ethanol injection 1 h before sacrifice (Ethanol), and repeated ethanol treatment with last ethanol injection >14 h before sacrifice (Withdrawal).
